St John weather in August 2025

Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in St John in August. Check more long-term weather averages for St John in August before you book your next holiday to New Brunswick in 2025/2026.

  • 21°C maximum daytime temperature in August in St John21
    21°C max day temperature
  • 7 hours of sunshine per day
  • 12 days with some rainfall in August in St John12
    12 days with some rainfall
  • 13°C minimum night-time temperature in August in St John13
    13°C min night temperature
  • 14 hours of daylight per day in August in St John14
    14 hours of daylight per day
  • No heat & humidity in August in St John0
    No heat & humidity
  • 97 mm monthly rainfall in August in St John97
    97 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in St John7
    7 (High) UV index
  • 13°C sea temperature in August in St John13
    13°C sea temperature

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The August weather guide for New Brunswick (St John) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in St John in August?

Daytime temperatures usually reach 21°C in St John in August, falling to 13°C at night.

How sunny is it in St John in August?

There are normally 7 hours of bright sunshine each day in St John in August - that's 50% of daylight hours.

How warm is the sea around St John in August?

The average sea temperature around St John in August is 13°C.

Does it rain in St John in August?

There are usually 12 days with some rain in St John in August and the average monthly rainfall is 97mm.

St John August sunrise & sunset times

Browse the sunrise and sunset times for St John in August 2025. Select a month to view St John sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:09 19:51
Saturday, 16th August 2025 05:27 19:29
Sunday, 31st August 2025 05:45 19:03

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